Chad or me wrong about hemi-acetals and -ketals

[JohnnnyD]

Is chad wrong here? Wouldnt that be a hemiketal since the carbon attached to the 2 oxygens has 2 R groups in the top image? or am i just a no good idiot ******* loser who doesnt know anything and deserves to die young?

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[terry gordy]

Is chad wrong here? Wouldnt that be a hemiketal since the carbon attached to the 2 oxygens has 2 R groups in the top image? or am i just a no good idiot ******* loser who doesnt know anything and deserves to die young?

If you took organic chemistry in the 80's, most people learned that acetal is derived from an aldehyde and a ketal is derived fom a ketone. Somewhere along the line they got lazy and decided to just call both of them acetals.

I know marc loudon's organic chemistry textbook from the mid 80's clearly distinguishes between ketals and acetals.

For the DAT, I would keep the difference in mind because it's likely that the test writer is an old withered fuddy duddy who uses nomenclature that is no longer used.

 

[AllahIsGreater]

If you took organic chemistry in the 80's, most people learned that acetal is derived from an aldehyde and a ketal is derived fom a ketone. Somewhere along the line they got lazy and decided to just call both of them acetals.

I know marc loudon's organic chemistry textbook from the mid 80's clearly distinguishes between ketals and acetals.

For the DAT, I would keep the difference in mind because it's likely that the test writer is an old withered fuddy duddy who uses nomenclature that is no longer used.

exactly what i have been telling these guys since day one. forget that hemi-ketal or junk. its either a HEMI-ACETAL or an ACETAL/KETAL. Thats IT!!!!!!!!

 

[JohnnnyD]

exactly what i have been telling these guys since day one. forget that hemi-ketal or junk. its either a HEMI-ACETAL or an ACETAL/KETAL. Thats IT!!!!!!!!

so for the DAT the left is a hemi-acetal and the right is both an acetal and a ketal? or does the R2 on the left need to be an H?